Where is the knock sensor on a 93 chevy c2500 with the 5.7L engine and an automatic trans

Nathan, 2 Knock's are located under intake manifold.
Check the attached links,
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How To Install Replace Engine Knock Sensor 2000 06 5 3L Silverado Sierra...

Knock sensor 5 3 4 8 6 0 replacement

05 Chevy Avalanche Knock Sensors

4 8 5 3 6 0 knock sensor replacement GM

If the code is p0325, it should be repaired, HOWEVER, on nissan products from 1996 to 2002, a p0325 does NOT illuminate the check-engine lamp. Knock sensor on that vehicle is for PING control not for emissions reduction. On other vehicles (say a chevy with a p0325) it WILL light the check engine lamp which is an automatic smog fail.

located on the rear(firewall) of the engine below the exhaust manifold usually between the front 2 cylinders. it has a single wire attached to it and is about 1.5/2 inches in diameter.

knock sensor located on the side cylinder block below intake manifold.

Cv joints usually knock or click, especially when turning. Open the hood, start the engine and while looking at the engine from the drivers seat put foot on brake and shift to reverse. if the engine jumps, must have a bad mount. also may try giving it a little gas while holding brake to make sure. also try it it drive as well. chances are its the trans mount going bad.


note: if there are any oil leaks that are getting the mount wet it will continue to fail.

p0300 is engine misfire
could be injectors or coils

you may have to get the new engine harners wires and pcm form the 94 model, that will sove your problem

You didn't list your engine size so please pick the applicable to your motor size:

Removal & Installation 2.8L & 2.9L Engines To Remove:

1. Lift the vehicle high enough to gain access to the knock sensor (KS) through the left front wheelhouse.
2. Remove the left front wheel and wheelhouse liner.

Knock sensor (KS) (A), Engine harness (B), Knock sensor (KS) connector (C)

1. Disconnect the knock sensor (KS) connector.
2. Detach the knock sensor (KS) from the engine block.

To Install:

1. Attach the knock sensor (KS) to the engine block.
   • Tighten the bolt to 18 ft lbs (25 Nm).
2. Connect the knock sensor (KS) connector.
3. Install the left front wheelhouse liner and wheel.
4. Fully lower the vehicle.

hi Tellyehmaak.
go to this link might help you find where it is.
Where is Knock sensor Toyota Previa 93 Google Search

The knock sensor is on the back side of the engine near the trans. It is round, with a 1 wire connector. You will have to get it from underneath. Good Luck.